hi all,i have a problem with the drivers door on my 2001 bmw e39 5 series,i can hear the central locking opening and closing but the actual lock itself is not releaseing from the reciever on the car,anybody got any tips to get at the lock without wrecking the door panel,i read somewhere that the grease bmw use on their door locks turns to a glue like substance in cold weather conditions and will not release until weather becomes warmer,any help would be much appreciated,thanks